Term in Recaman's sequence A005132 where n appears for first time, or 0 if n never appears.
1, 4, 2, 131, 129, 3, 5, 16, 14, 12, 10, 8, 6, 31, 29, 27, 25, 23, 99734, 7, 9, 11, 13, 15
2 seqfan posts
Fri Oct 9 22:35:28 CEST 2009 [seqfan] Re: Natural angry numbers